A can do a piece of work in 9 days, In how many days can the work be completed if A and B work together ?

A can do a piece of work in 9 days and B can do the same in 12 days. In how days can the work be completed if A and B work together?

The ratio of work efficiency of A & B is 2:5 . If A can complete a work in 10 days. In how many days the work can be completed by B and when they work together , in how many days the work would be completed ?

Sunny can complete a piece of work in 30 days He worked for 6 days and left. Bunny completed the remaining work in 16 days. In how many days can the entire work kbe completed if they worik together?

A and B together can do a piece of work in 12 days. While B and C together can do a piece of work in 8 days. C and A together can do a piece of work in 6 days. In how many days will this work be completed by B alone?

A takes as much time as B and C together to complete a work. While A and B together can do this piece of work in 10 days. C alone can do this piece of work in 50 days. In how many days will this work be completed by B alone?